Effect of Uplift and Soil Nonlinearity on Plastic Hinge Development and Induced Vibrations in Structures

Qin, Xiaoyang; Chen, Y; Chouw, Nawawi

doi:10.1260/1369-4332.16.1.135

Cited by 37 publications

(23 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Uplift resistance of the base plate from Malhotra [26]. this way, the Cauchy number, as defined by [20], is considered to meet the requirements of similitude. This relation is shown in Equation (1):…”

Section: Tank Modelmentioning

confidence: 99%

See 1 more Smart Citation

The effect of seismic uplift on the shell stresses of liquid‐storage tanks

Ormeño

Larkin

Chouw

2015

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

Summary Previous theoretical studies have shown that tank uplift, that is, separation of the tank base from the foundation, generally reduces the base shear and the base moment. However, there is a paucity of experimental investigations concerning the effect of uplift on the tank wall stresses, which is the principal parameter that controls the seismic design of liquid‐storage tanks. This paper reports a series of shake table experiments on a polyvinyl chloride model tank containing water. A comparison of the seismic behaviour of the tank with and without anchorage is described. Stochastically generated ground motions, based on a Japanese design spectrum, and three tank aspect ratios (liquid‐height/radius) are considered. Measurements were made of the stresses at the outer shell of the tank, the tank wall acceleration and the horizontal displacement at the top of the tank. While the top displacement and the tank shell acceleration increased when uplift was allowed, axial compressive stresses decreased by between 35% and 64% with tank uplift. The effect of uplift on the hoop stresses was variable depending on the aspect ratio. A comparison of experimental values with a numerical model is provided. Copyright © 2015 John Wiley & Sons, Ltd.

show abstract

Section: Tank Modelmentioning

confidence: 99%

“…For this reason, only the rocking performance of the rigid body was considered in these investigations, while the natural modes of the structures were ignored. Qin et al [20] showed that uplift can reduce plastic hinge development of the structure. Qin et al [20] showed that uplift can reduce plastic hinge development of the structure.…”

Section: Introductionmentioning

confidence: 99%

The effect of seismic uplift on the shell stresses of liquid‐storage tanks

Ormeño

Larkin

Chouw

2015

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

show abstract

“…Acikgoz and DeJong (2012) extended the understanding of rocking structures by including the elastic oscillations of the structure itself (theretofore considered to be entirely rigid). Qin et al (2013), has demonstrated the influence of the nonlinear behaviour of the soils under a rotating foundation, and how this can reduce the ductility demand on the structure itself. Kelly (2009) proposed a tentative design procedure for rocking multi-storey structures in which a substitute structure approach was taken.…”

Section: Structural Moveablilitymentioning

confidence: 99%

A low damage and ductile rocking timber wall with passive energy dissipation devices

Loo

Quenneville

Chow

2015

Earthquakes and Structures

View full text Add to dashboard Cite

Abstract. In conventional seismic design, structures are assumed to be fixed at the base. To reduce the impact of earthquake loading, while at the same time providing an economically feasible structure, minor damage is tolerated in the form of controlled plastic hinging at predefined locations in the structure. Uplift is traditionally not permitted because of concerns that it would lead to collapse. However, observations of damage to structures that have been through major earthquakes reveal that partial and temporary uplift of structures can be beneficial in many cases. Allowing a structure to move as a rigid body is in fact one way to limit activated seismic forces that could lead to severe inelastic deformations. To further reduce the induced seismic energy, slip-friction connectors could be installed to act both as hold-downs resisting overturning and as contributors to structural damping. This paper reviews recent research on the concept, with a focus on timber shear walls. A novel approach used to achieve the desired sliding threshold in the slip-friction connectors is described. The wall uplifts when this threshold is reached, thereby imparting ductility to the structure. To resist base shear an innovative shear key was developed. Recent research confirms that the proposed system of timber wall, shear key, and slip-friction connectors, are feasible as a ductile and lowdamage structural solution. Additional numerical studies explore the interaction between vertical load and slip-friction connector strength, and how this influences both the energy dissipation and self-centring capabilities of the rocking structure.

show abstract

“…Recently, the effects of uplift on the response of liquid 2 Shock and Vibration storage tanks structures and nuclear plants have also been studied [7][8][9][10][11]. Qin et al [12] studied the influence of footing uplift on the induced vibration of secondary structures. It was reported that footing uplift can not only reduce the response of structures but also reduce the induced vibrations of secondary structures.…”

Section: Introductionmentioning

confidence: 99%

Shake Table Study on the Effect of Mainshock-Aftershock Sequences on Structures with SFSI

Qin

Chouw

2017

Shock and Vibration

View full text Add to dashboard Cite

Observations from recent earthquakes have emphasised the need for a better understanding of the effects of structure-footing-soil interaction on the response of structures. In order to incorporate the influences of soil, a laminar box can be used to contain the soil during experiments. The laminar box simulates field boundary conditions by allowing the soil to shear during shake table tests. A holistic response of a structure and supporting soil can thus be obtained by placing a model structure on the surface of the soil in the laminar box. This work reveals the response of structure with SFSI under mainshock and aftershock earthquake sequences. A large (2 m by 2 m) laminar box, capable of simulating the behaviour of both dry and saturated soils, was constructed. A model structure was placed on dry sand in the laminar box. The setup was excited by a sequence of earthquake excitations. The first excitation was used to obtain the response of the model on sand under the mainshock of an earthquake. The second and third excitations represented the first and second aftershocks, respectively.

show abstract

Effect of Uplift and Soil Nonlinearity on Plastic Hinge Development and Induced Vibrations in Structures

Cited by 37 publications

References 20 publications

The effect of seismic uplift on the shell stresses of liquid‐storage tanks

The effect of seismic uplift on the shell stresses of liquid‐storage tanks

A low damage and ductile rocking timber wall with passive energy dissipation devices

Shake Table Study on the Effect of Mainshock-Aftershock Sequences on Structures with SFSI

Contact Info

Product

Resources

About